<div id="result">
</div>
<div id="add_user">
  <label for="username">用户名</label>
  <input type="text" name="username" id="username">
  <label for="password">密码</label>  
  <input type="password" name="password" id="password">
  <input type="button" value="Add" onclick="do_add_user()">
</div>
